From c79fa3e212e8bb49f950da3c3218e32e3b9df2ec Mon Sep 17 00:00:00 2001
From: Joris
Date: Sun, 1 Nov 2015 20:10:28 +0100
Subject: Give access to sharedCost if someone click on the sign in link and is
 already connected

---
 src/server/Controller/SignIn.hs | 49 +++++++++++++++++++++++++++--------------
 src/server/Secure.hs            |  1 +
 2 files changed, 34 insertions(+), 16 deletions(-)

(limited to 'src/server')

diff --git a/src/server/Controller/SignIn.hs b/src/server/Controller/SignIn.hs
index 5306ee1..31cd510 100644
--- a/src/server/Controller/SignIn.hs
+++ b/src/server/Controller/SignIn.hs
@@ -18,6 +18,7 @@ import qualified Data.Text as T
 import qualified Data.Text.Lazy as TL
 import qualified Data.Text.Encoding as TE
 import Data.Time.Clock (getCurrentTime, diffUTCTime)
+import Data.Maybe (isJust)
 
 import qualified LoginSession
 
@@ -35,6 +36,8 @@ import Model.Message (getMessage)
 
 import Json (jsonError)
 
+import Secure (getUserFromToken)
+
 import qualified View.Mail.SignIn as SignIn
 
 signIn :: Config -> Text -> ActionM ()
@@ -59,24 +62,38 @@ signIn config login =
 
 validateSignIn :: Config -> Text -> ActionM ()
 validateSignIn config textToken = do
-  mbToken <- liftIO . runDb $ getSignInToken textToken
-  now <- liftIO getCurrentTime
+  alreadySigned <- isAlreadySigned
+  if alreadySigned
+    then
+      redirect "/"
+    else do
+      mbSignIn <- liftIO . runDb $ getSignInToken textToken
+      now <- liftIO getCurrentTime
+      case mbSignIn of
+        Just signIn ->
+          if signInIsUsed . entityVal $ signIn
+            then
+              redirectError (getMessage SignInUsed)
+            else
+              let diffTime = now `diffUTCTime` (signInCreation . entityVal $ signIn)
+              in  if diffTime > (fromIntegral $ (signInExpirationMn config) * 60)
+                    then
+                      redirectError (getMessage SignInExpired)
+                    else do
+                      LoginSession.put (signInToken . entityVal $ signIn)
+                      liftIO . runDb . signInTokenToUsed . entityKey $ signIn
+                      redirect "/"
+        Nothing ->
+          redirectError (getMessage SignInInvalid)
+
+isAlreadySigned :: ActionM Bool
+isAlreadySigned = do
+  mbToken <- LoginSession.get
   case mbToken of
-    Just token ->
-      if signInIsUsed . entityVal $ token
-        then
-          redirectError (getMessage SignInUsed)
-        else
-          let diffTime = now `diffUTCTime` (signInCreation . entityVal $ token)
-          in  if diffTime > (fromIntegral $ (signInExpirationMn config) * 60)
-                then
-                  redirectError (getMessage SignInExpired)
-                else do
-                  LoginSession.put (signInToken . entityVal $ token)
-                  liftIO . runDb . signInTokenToUsed . entityKey $ token
-                  redirect "/"
     Nothing ->
-      redirectError (getMessage SignInInvalid)
+      return False
+    Just token -> do
+      liftIO . runDb . fmap isJust $ getUserFromToken token
 
 redirectError :: Text -> ActionM ()
 redirectError msg =
diff --git a/src/server/Secure.hs b/src/server/Secure.hs
index 8565098..192fa10 100644
--- a/src/server/Secure.hs
+++ b/src/server/Secure.hs
@@ -2,6 +2,7 @@
 
 module Secure
   ( loggedAction
+  , getUserFromToken
   ) where
 
 import Web.Scotty
-- 
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